Merge pull request 'complete all parts' (#1) from develop into main { score : 500/500 }

Reviewed-on: #1

src/main/java/Main.java

@@ -15,15 +15,26 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
-        // TODO:
-        // - Read each line from products.csv
-        // - For each line, parse productId, name, and price
-        // - The format of the file is like this:
-        //      [productId],[name],[price]
-        // - Store Product objects in the productCatalog ArrayList
-
-        // NOTE
-        // - The data in products.csv is guaranteed to be valid.
+        while (scanner.hasNextLine())
+        {
+            String line = scanner.nextLine();
+            String[] parts = line.split(",");
+            if(parts.length == 3)
+            {
+                try
+                {
+                int id = Integer.parseInt(parts[0]);
+                String name = parts[1];
+                double price = Double.parseDouble(parts[2]);
+                productCatalog.add(new Product(id, name, price));
+                }
+                catch (NumberFormatException e)
+                {
+                    System.err.println("Invalid format in products.csv: " + line);
+                }
+            }
+        }
+        scanner.close();
     }
 
     public static void main(String[] args)

src/main/java/ReportGenerator.java

@@ -1,3 +1,7 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.List;
 
 public class ReportGenerator {
@@ -17,67 +21,84 @@ public class ReportGenerator {
 
     public void processFile()
     {
-        // TODO:
-        // 1. Open the order details CSV file
-        // 2. Read the file line by line
-        // 3. Split each line using comma delimiter
-        //      (each line is guaranteed to contain exactly two commas)
-        // 4. Each line contains exactly 3 values in the format:
-        //      [productId],[quantity],[discountPercent]
-        // 5. Attempt to convert values:
-        //      - productId -> int
-        //      - quantity -> int
-        //      - discountPercent -> int
-        //    NOTE:
-        //      - quantity and discountPercent may contain invalid characters
-        //        (e.g., letters instead of numbers).
-        //      - If parsing any value fails (NumberFormatException),
-        //        the entire line must be considered invalid.
-        //      - Use try-catch blocks and exception handling to safely
-        //        handle parsing and validation errors without stopping
-        //        the processing of the remaining lines.
-        // 6. Validate parsed values:
-        //      - productId must be greater than 0
-        //      - quantity must be greater than 0
-        //      - discountPercent must be between 0 and 99 inclusive
-        // 7. Look for a Product in productList that matches productId
-        // 8. If no Product with that ID exists in the catalog,
-        //      the entire line is considered invalid
-        // 9. If all values are valid and the product exists, calculate:
-        //      subtotal = quantity * product price
-        //      discountValue = subtotal * discountPercent / 100
-        //      finalCost = subtotal - discountValue
-        // 10. Update report totals:
-        //      - totalQuantity += quantity
-        //      - totalFinalCost += finalCost
-        //      - totalDiscountValue += discountValue
-        // 11. If any parsing error, validation failure, or missing product occurs:
-        //      - increment totalInvalidLines
-        //      - skip the line and continue processing the next line
-        // 12. Close all file resources
+
+        try (BufferedReader reader = new BufferedReader(new FileReader(ordersFilePath)))
+        {
+            String line;
+            while ((line = reader.readLine()) != null)
+            {
+                String[] parts = line.split(",");
+                if (parts.length != 3)
+                {
+                    totalInvalidLines++;
+                    continue;
+                }
+
+                try
+                {
+                    int id = Integer.parseInt(parts[0]);
+                    int quantity = Integer.parseInt(parts[1]);
+                    int discountPercent = Integer.parseInt(parts[2]);
+                    if (id <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+                    Product product = findProductById(id);
+                    if (product == null)
+                    {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                    double subtotal = quantity * product.getPrice();
+                    double discountValue = subtotal * discountPercent / 100.0;
+                    double finalCost = subtotal - discountValue;
+                    totalQuantity += quantity;
+                    totalFinalCost += finalCost;
+                    totalDiscountValue += discountValue;
+                }
+                catch (NumberFormatException e)
+                {
+                    totalInvalidLines++;
+                }
+            }
+        }
+        catch (IOException e)
+        {
+            System.err.println("Error reading order file: " + e.getMessage());
+        }
+    }
+
+    private Product findProductById(int id) {
+        for (Product p : productList) {
+            if (p.getProductID() == id) {
+                return p;
+            }
+        }
+        return null;
     }
 
     public void saveReport()
     {
-        // TODO:
-        // 1. Build a formatted report string
-        // 2. Include:
-        //      - total quantity
-        //      - total final cost
-        //      - total discount value
-        //      - total invalid lines
-        // 3. Create/open output report file (name it report.txt)
-        // 4. Write report string into file
-        // 5. Handle file writing exceptions
-        // 6. Close writer resources
-
-        /* Example Structure
-        ========= SALES REPORT =========
-        Total Quantity Sold: 42
-        Total Final Cost: $1520.75
-        Total Discount Value: $230.50
-        Invalid Rows: 3
-        ================================
-        */
+        String report = String.format(
+                "========= SALES REPORT =========\n" +
+                        "Total Quantity Sold: %d\n" +
+                        "Total Final Cost: $%.2f\n" +
+                        "Total Discount Value: $%.2f\n" +
+                        "Invalid Rows: %d\n" +
+                        "================================\n",
+                totalQuantity,
+                totalFinalCost,
+                totalDiscountValue,
+                totalInvalidLines
+        );
+        try (FileWriter writer = new FileWriter("report.txt"))
+        {
+            writer.write(report);
+        }
+        catch (IOException e)
+        {
+            System.err.println("Error saving report: " + e.getMessage());
+        }
     }
 }